The NetworkChange class provides address change notification by raising NetworkAddressChanged events. An interface address can change for many reasons, such as a disconnected network cable, moving out of range of a wireless Local Area Network, or hardware failure.

To receive notification, you must identify your application's event handlers, which are one or more methods that perform your application-specific tasks each time the event is raised. To have a NetworkChange object call your event-handling methods when a NetworkAddressChanged event occurs, you must associate the methods with a NetworkAddressChangedEventHandler delegate, and add this delegate to the event.

This class is used to enable basic detection of changes in network state, such as address or interface state changes. The resulting capabilities allow applications to maintain internal application state to optimize whether to make remote network calls or to retrieve data from a local content cache, a core requirement to enable offline application scenarios.